(Reaffirmed 2002) Is a45727 - 1972 Indian Standard -SPECIFICATION FOR FIRECLAY CHECKER-BRICKS FOR OPEN-HEARTH FURNACE Refractories Sectional Committee, SMDC Chair&n SHRI J. C. BANRRJEE 107 C. I. T. Road, Belcghata. Calcutta 10 Members CDR S. P. AGARWAL.A Swru B. S. KAPUR ( Alternate ) SHRI T. R. ANA~~I-HARAMAN Representing Naval Headquarters 18 Hindustan Steel Ltd ( Central Engineering & Design Bureau ) , Ranchi SHRI B. RAMACHAN~JRAN ( Aflnnute ) The Associated Cement Companies Ltd, Bombay SHRI R. V. BAINDOOR SHRI J. 1'. JOSHI ( Alfernafc ) Hindustan Steel Ltd (Alloy Steels Plant ), Durgapur SHRX I. B. BANERJEE The Ishwar Industries Ltd, New Delhi SHRI B. N. BHASKAR SHRXR. N. BHASKAR( Akmate ) Bird & Co Private Ltd, Calcutta SHRI H. V. BHASKARRAO SHRX A. SEN ( Alternate) Directorate General of Technical Development, SHRID.S.CWAB~AL New Delhi Directorate General of Ordnance Factories, Calcutta SHRID.K.CHAKRAVORTY M. N. Dastur 8; Co ( Private) Ltd, Calcutta SHRI D. K. CHA~TERJEE SHRI R. C. NANDY ( Alternate ) CHEMIST & METALLURGIST( S. F. ), Ministry of Railways CHITTARANJAN LOCOMOTIVE WORKS,CHITTARANJAN DEPUTY DIREWR(ZT-3 ), RESEARCH, AND STAVDARDS ORGANIZATION, CHITTARANJAN ( Alternate) Bokaro Steel Ltd, Bokaro SHRI B.K.P. CHIBBAR Indian Engineering Association, Calcutta SHRI A.E. CRAWLEY SHRIN. K. BHAMBHANE (Alternate) Orissa Cement Ltd, Rajgangpur SHRI M. H. DALMIA DR J. D. PANDA ( Alfernate) National Test House, Calcutta SHRI G. C. D,Q Orissa Industries Ltd, Rourl;ela DR S. S. DAS SHRI K.&PANDA (Alferna!e) ( Continued on page 2 ) @ INDIAN Cojyright 1973 INSTITUTION STANDARDS This publication is protected under the Zndiun Copyright Act (XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act. IS : 6727 - 1972 1) (Confinucdffom~gd Members Refwcsenting Hiidustan Steel Ltd ( Bhilai Steel Piant ), Bbilai SHRI M.H. GAJENDRAGADKAR SHRI S. K. MUKHERJEE ( Altcmafc j i'he Parshuram Pottery Works Co Ltd. Morvi SHIU ACHYUT A. GANPULE .%a1 V. H. APACHE ( Alternate ) Belpabar Refractories Ltd, Bc!pahar DR S. S. GHOSE DR A. K. Bos~3 ( d?nnoft) India Fire Bricks & Insulation Co Ltd, Marar, SWR1R.K. GoVINDACHAR , Distt Hazari Bagh ( Bihar ) SHRt S. K. BISWAS ( Alfunafc ) Sndian Iron & Steel Co Ltd, Burnpur SHRI EC. K. GUPTA ROY SHRI D. N. BANERJEE ( Alfematt ) All India Glass Manufacturers' Federation, New SHRI X. P. JHKXJHUNWALA Delhi SHRI R. C. SINGHAL ( Altcmafc ) Bhupal Mining Works, Bhilwara SH~I K. L. MATHUR SHRI K. N. MATHUR ( A/female ) capacity (_P 16/lB, Keyafulu Lane, In personal DR H. K. MITRA Cu!cutla29) The Behar Firebricks & Potteries Ltd. Dhanbad SHRI K. N. MUKHERJEE SHRI S. X. BAXERJEE ( Alfwnufc ) liational Metallurgical Laboratory (CSIR) , SHRI H. P. S. MURT~Y Jamshcdpur Harry Refractory & Ceramic Works Private Ltd, SHRI J. R. K. MURTHY Calcutta SHRI A. B~su ( Alfcmute ) Central Glass & Ceramic Research Institute DR D. N. NANDI ( CSIR ), Calcutta SHRI N. B. CHATTERJEE( Altnnatc ) The Engineering & Mineral Industrial Research SHRI P. S. XARAYANA Laboratory, Bangalore The Tata Iron & Steel Co Ltd, Jamshedpur DR B. RAO SHRI B. N. GHOSH ( Altemak) Hindustan Steel Ltd (Durgapur Steel Plant ), SHRI D. S. J. RAO Durgapur SHRI I. C. MODI ( SHRI D. K. RAY SHRI B. B. BMERJEE Ah-mote ) Inspection Wing, Directorate Disposals, New Delhi General of Supplies 8r ( .4lkrnafr ) SHRID.R.SUBRAMANIAN SHRI I;. N. MARWAHA SHR~ P. S. SUNDARAM Bum gL Co Ltd, Calcutta ( Alkrnot~ ) Hindustan Steel Rourkela ) Director General, IS1 ( Ex-@i&o Member ) Ltd (Rourkela Steel Plant ), SHRI 3cl. PRASAD ( Ahmate SHRI R. I;. SRZVASTAVA, Deputy Director ( Strut gi Met j ( Sem la?7 ) ( Confined ORpage 6 ) 2 IS : 6727- 1972 Indian Standard SPECIFICATION FOR FIRECLAY CHECKER-BRICKS FOR OPEN-HEARTH FURNACE 0. FOREWORD 0.1 This Indian Standard was adopted by the Indian Standards Institution on 25 October 1972, after the draft finalized by the Refractories Sectional Committee had been approved by the Structural and Metals Division Council. 0.2 This standard keeps in view the manufacturing followed in the country in this field. 0.3 This standard contains clause 4.2 which the purchaser and the manufacturer. and trade practices between calls for agreement 0.4 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded offin accordance with The number of significant places retained in the rounded off IS : 2-1960*. value should be the same as that of the specified value in this standard, 1. SCOPE 1.1 This standard hearth furnace. 2. TYPES 2.1 Fireclay checker-bricks and Type 3. 3: SUPPLY OF shall be of three types, namely, Type 1, Type 2 covers requirements for fireclay checker-bricks for open- MATERIAL of fireclay checker-bricks 3.1 General requirements relating to the supply shall be as laid down in IS : 1387-1967t. *Rules for rounding off numerical values ( m&d). tGenera1 requirement3 for the supply of metallurgical materials (first revision ). 3 IS : 6727 - 1972 3.2 The checker-bricks shall be compact, of homogeneous texture and free from cracks, internal fissures, cavities, voids and other flaws, They shall be burnt evenly throughout, and shall have sufficient mechanical strength and no soft corners. 4. TOLERANCE 4.1 Rectangular ON SIZE Checker-Bricks Variations from specified length and thickness shall be allowed to the extent of 2 y.5 percent or 2 3"mm whichever is greater. and/or specifi4.2 Special Shapes - Size iolerance for interlocking ed checkers shall be as agreed to between the purchaser and the manufacturer. 5. CHEMICAL COMPOSITION when determined in 5.1 The alumina content of fireciay checker-bricks, accordance with IS : 1335-1959*, shall be as follows: Type 1 Type 2 Type 3 6. PHYSICAL REQUIREMENTS Percent, Min 30 36 39 ments given in Table 6.1 The three types of fireclay checker-bricks 1. 7. MARKING shall conform to the require- 7.1 The checker-bricks shall be clearly marked with the manufacturer's name or trade-mark, and type. 7.1.1 Mark. The checker-bricks may also be marked with the IS1 Certification XOTE- The use of the IS1 Certification Mark is governed by the provisions of the Indian Standards Institution ( Certification Marks ) Act and the Rules and Regulations made thereunder. The ISI Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well-drfined system of inspection, testing and quality control which is devised and supervised by ISI and operated by the producer. IS1 marked products are also continuously checked by IS1 for conformity to that standard as a Details of conditions under which a licence for the use of the ISI further safeguard. Certification Mark may be granted to manufacturers or processors, may be obtained from the Indian Standards Institution. *Methods for the direct determination of alumina in refractory materials ( tentu& )_ 4 IS : 6727 - 1972 TABLE 1 PHYSICAL REQUIREMENTS FOR FIRECLAY CHECKER-BRICKS ( czause 6.1 ) I%. (1) ij CHARAIXERBTIC w-3 REQUIREMENT Type 1 . Type 2 (4) 313 Type 3 METHODOPTEST (REP TOCIAUSE No. OF IS : 15281962* ) (6) 3 (2) Pgrometric cone equivalent, Standard Pvrometric Cone : AST?rI j'Kumber, (3) 30 (5) 33 3lin ii) iii) iv) v) Refractoriness under ( ra). "C, L%fzn Apparent 11faax load 1 300 25 200 _-& 1.5 5 1400 22 250 1.0 1450 19 300 -& I.0 4 9 6 porosity, percent, strengrh, Cold crushing kgflcm", Min "eayzrncnt linear change reheating for 2 hours at 14OO"C, percent, b&w 8 *Methods of sampling and physical tests for refractory materials. 8. SAMPLING 8.1 Representative sampling standard. given samples shall in IS : 152%lY62* be drawn according to. the scheme of for carrying out tests specified in this *Methods of sampling and physical tests for refractory materials. 5 13:6727-1972 Refractories Investigations Subcommittee, CO?WtttU SMDC 18 : 3 SHRIJ. C. BA~`ERJEE 107 C. I. T. Road, Beleghata, Calcutta 10 Rtpwsmting Members Hindustan Steel Ltd ( Alloy Steels Plant ), Durgapur 1. B. -BANERJEE The Ishwar Industries Ltd, New Delhi SWRI B. N. BHASKAR 5511~1 R. N. BHASKAR( AIfernale) Hindustan Steel Ltd ( Bhilai Steel Plant ), Bhilai SHRI 31. CHANDRASEKHAR SlIRl S. I;. hlUKlrERJEE( Al~efIUZ~G ) Orissa Industries Ltd, Rourkela DR S. S. DAS SHRI IL. K. PANDA ( Alkmate ) Belpahar Refractories Ltd. Belpahar DR S. S. GHOSE Indian Refractory Makers Association, Calcutta SHRI D. GOPAUKRISHNAN DR J.D. PANDA (Alfcmafe) -Indian Iron & Steel Co Ltd, Bumpur SHRI K. K. GUPTA ROY SHRI D. N. BANERJEE ( Alfernotc ) Hindustan Steel Ltd (Durgapur Steel Plant ), DR G. N. MOHAWN Durgapur SHRI 0. P. SANDHIR ( Alternote ) India Refractories, Calcutta SHRI S. L. MO~TRA SHRI S. S. MAUN ( A[lrmatc j National Metallurgical Laboratory ( CSIR ), SHRI H. P. S. hfURTHY Jamshedpur Harry Refractory & Ceramic Works Private Ltd, SHRI J. R. K. MVRTHY Calcutta SHRI A. B.QU ( Altemok ) Central Glass & Ceramic Research Institute DR D. N. NANDI ( CSIR ), Calcutta SHRI N. B. CHA~ERJEE ( Ahmak ) Orissa Cement Ltd, Rajgangpur DR J. D. PA~~)A The Tata Iron 8r Steel Co Ltd, Jamshedpur DRB.RAO SHRI B. N. GHOSH ( Alternate ) Bum & Co Ltd, Calcutta SHRID.R.S"RRAMANIAN Snm K. N. MARWAHA (A/ternote ) Hindustan Steel Ltd (Rourkelu Steel Plant ). SHRI P. S. S~~ARAM Rourkela SHRI 6